High force solenoid and solenoid-driven actuator
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United States of America Patent
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Aug 16, 2005
Grant Date -
Aug 12, 2004
app pub date -
Feb 11, 2003
filing date -
Feb 11, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A solenoid having increased axial force and low static friction on the armature is disclosed and provides an improved solenoid-driven hydraulic valve actuator. The solenoid includes a coil member, a pole piece having an inside surface with recessed and non-recessed portions to form an inner recess in the pole piece, an armature inside the pole piece, and a bearing held in the recess between the pole piece and armature, the bearing having an inner surface extending inwardly just beyond the inside surface of the pole piece non-recessed portion.
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